// 开源地址: https://gitee.com/virus010101/linfeng-community
package io.acm.modules.app.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.Date;

/**
 * jwt工具类
 *
 */
    @ConfigurationProperties(prefix = "acm.jwt")
    @Component
    public class JwtUtils {
        private Logger logger = LoggerFactory.getLogger(getClass());

        private String secret;
        private long expire;
        private String header;

        /**
         * 生成jwt token
         */
        public String generateToken(long userId) {
            Date nowDate = new Date();
            //过期时间
            Date expireDate = new Date(nowDate.getTime() + expire * 1000);

            return Jwts.builder()
                    .setHeaderParam("typ", "JWT")
                    .setSubject(userId+"")
                    .setIssuedAt(nowDate)
                    .setExpiration(expireDate)
                    .signWith(SignatureAlgorithm.HS512, secret)
                    .compact();
        }

        //解析成功则返回 Claims 对象
        public Claims getClaimByToken(String token) {
            try {
                return Jwts.parser()
                        .setSigningKey(secret)
                        .parseClaimsJws(token)
                        .getBody();
            }catch (Exception e){
                logger.debug("validate is token error ", e);
                return null;
            }
        }

        /**
         * token是否过期
         * @return  true：过期
         */
        public boolean isTokenExpired(Date expiration) {
        return expiration.before(new Date());
    }

    public String getSecret() {
        return secret;
    }

    public void setSecret(String secret) {
        this.secret = secret;
    }

    public long getExpire() {
        return expire;
    }

    public void setExpire(long expire) {
        this.expire = expire;
    }

    public String getHeader() {
        return header;
    }

    public void setHeader(String header) {
        this.header = header;
    }
}
